I brought back a small amount from a-dam about a month after 9-11. I took about 10 grams of hash and 5 grams of nugs, wrapped them in 7 non-lubricated condoms (one inside the other, then tied them off), then took a shower with them and washed them off very very well. Tapped it to the inside of my thigh right up next to my crotch. By the time I landed at JFK I could smell it myself (though it was very faint, and didn't seem like anyone around me noticed). I don't think I'll try something like that again, just seemed so sketchy.
Though I have suspected that most dogs at airports are trained to sniff out explosives and accelerants, not even sure they are trained for drugs usually. I know I walked by dogs in JFK and if I could smell it, I'm sure the dogs could smell it down the hallway, but they didn't even look at me.